Image Trouble - Sony FWD-42PX2 Service Manual
Flat panel display
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Also See for FWD-42PX2:
- Operating instructions manual (352 pages) ,
- Protocol manual (26 pages) ,
- Dimensions (3 pages)
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3-3. Image Trouble
Main symptoms
. Dot noise
. Picture noise
. No image
. Broken OSD
. No screen saver
. Flashing picture
Image is abnormal.
Are all input signals abnormal?
(RGB/DVI/YUV/CVBS)
Yes
Is the connection of the A board
abnormal?
. Image is not correctly displayed.
. Power goes off.
No
Is the G board abnormal?
. Image is dark or flashing.
. Power cannot be turned on,
or setting is reset.
No
Is the CTRL board abnormal?
(Refer to Sections 3-3-2 and
3-8.)
No
Is the Y-SUS board abnormal?
(Refer to Sections 3-3-2 and
3-8.)
No
Replace the Z-SUS board.
FWD-42PX2
. Bad color
. No inversion
. Dark picture
n
For the replacement parts, refer to Section 4.
The parts other than those described in Section 4 are
not service parts. When the replacement of those parts
is required, replace them in the assembly unit.
There is a high possibility that
No
the A board caused the trouble.
→ Replace the A board.
Connect correctly. If the trouble
Yes
persists, replace the A board.
Perform Va and Vs voltage adjustments.
Yes
(Refer to Section 2-3.)
If the trouble persists, replace the
G board.
Yes
Replace the CTRL board.
Yes
Replace the Y-SUS board.
. Vertical dot noise
. No power saving
. Unstable caption/text
n
After replacing the A board, perform the following
adjustments.
. AD calibration adjustment (Refer to Section 2.)
. White balance adjustment (Refer to Section 2.)
. EDID data input
. S-init Goods (Refer to Section 2.)
n
After replacing the A board, perform the following
adjustments.
. AD calibration adjustment (Refer to Section 2.)
. White balance adjustment (Refer to Section 2.)
. EDID data input
. S-init Goods (Refer to Section 2.)
n
After replacing the G board, perform
the following adjustments.
. Va Voltage Adjustment (Refer to Section 2-3.)
. Vs Voltage Adjustment (Refer to Section 2-3.)
n
After replacing the Y-SUS board, perform
the following adjustments.
. Vsc Adjustment (Refer to Section 2-4.)
. _Vy Adjustment (Refer to Section 2-4.)
. Unstable image
. Clock error
3-3
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